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Counter EMF (Back EMF) in DC Motors

With the armature rotating in the magnetic field, the armature conductors generate emf.

Thus the motor simultaneously acts as a generator.

Naturally, motor action is stronger than generator action.

The generated voltage opposes the supply voltage, thus limiting the armature current.

It is obvious that the back emf is proportional to the speed of rotation and the field flux.

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Tags: back-emf, counter-emf, dc-motors, Engineering

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